# SDR CALA2015011300043

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 13, 2015
- Submitted: January 13, 2015
- Operation: Air carrier
- Aircraft: [N15712](https://openairdocs.org/aircraft/N15712), registered now
- Make and model: Boeing 737724
- Aircraft serial: 28783
- Aircraft time: 54,183 hours, 18,413 cycles
- Engine: Cfmint CFM567B242
- System (JASC): [7320 · Fuel Controlling System](https://openairdocs.org/jasc/7320)
- Part: Hmu
- Part number: 1853M56P11
- Condition: Unserviceable
- Location: Nr 2 Engine
- Stage of operation: CR
- How discovered: O
- Nature of condition: R
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2015011300043

## Discrepancy

NUMBER 2 ENG SURGE, CRUISE FL 220, ENGS WERE RUNNING AROUND 74% N1 NR 2 ENG SURGED UNCONTROLLED AT 20 TO 305 TO 40%.  BROUGHT NR 2 ENG BACK UNDER 60% & STABILIZED.  STAYED UNDER 60% UNTIL LANDING, RT ENG CONTROL LIGHT ILLUMINATED ON GND.  TROUBLE SHOT IAW FIM TASK 71-05-00-810-805-F00.  RUN NR 2 ENG, FOUND NO FAULTS.  OPERATIONS CHECKED NORMAL.  LP 9127188 PRECAUTION.  R & R NR 2 HMU IAW 73-21-10.  OPERATIONS & LEAK CHECKED GOOD.

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